n1 = [normrnd(1:5,1./(1:5)); normrnd(1:5,1./(1:5)); normrnd(1:5,1./(1:5));]
n2 = normrnd(0,1,[1 5])
n3 = normrnd(0,1,[5 5])
n4 = normrnd([1 2 3;4 5 5],0.1,2,3)
